Revert "MB-11775: anticipate rebalance stop while verifying..."

This reverts commit 241702638d250c3104b1684f8374d3d079602186.

Change-Id: Iaf74e12bb9498e0c12cef6ecb92e75fd29f141f6
Reviewed-on: http://review.couchbase.org/39707
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>